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IEEE International Workshop on Anti-counterfeiting, Security, Identification, ASID

作者： Yi Li Xiaoyao Xie The School of Computer Science and Technology Guizhou University Guiyang China Key Laboratory of Information and Computing Science of Guizhou Guiyang China

The test floor of high temperature little flux and hot power is one testing system produced by one factory of Guiyang. The main function of the system is to test the radiatorpsilas heat dispersion attaining a designated standard or not. However, the temperature system of the test platform is a time lag nonlinear response system. Using the conventional PID control is unable to realize the effective control. The article describes the method based on expert PID control strategy to control the temperature of the system. The experimental results indicated that this algorithm may obtain the good control effect.

关键词： Calorimetry Three-term control Temperature control Petroleum system testing Fuels Lubricating oils Control systems Automatic control Production facilities

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Alternate Transmission Relaying Schemes for MIMO Wireless Networks

Alternate Transmission Relaying Schemes for MIMO Wireless Ne...

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IEEE Conference on Wireless Communications and Networking

作者： Heesun Park Joohwan Chun Scientific Computing Laboratory School of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

Enormous gains of using multiple antennas at both the transmitter and the receiver known as multiple-input multiple-output (MIMO) in wireless communication system have been predicted. Especially, significant improvements in spectral efficiency are given through spatial multiplexing which transmits independent data streams over multiple transmit antennas simultaneously. Recently, many researches demonstrate that similar performance gains are obtained in wireless relay networks with multiple antennas at each terminal. In this paper, we propose a relaying protocol named as alternate transmission relaying protocol which enhances the capacity of the given environment and describe the capacity of MIMO wireless relay networks for the proposed relaying protocol. We consider a system model which has K relay terminals between a designated source terminal and a designated destination terminal. The proposed protocol assumes that no interference exists among the relay terminals. The K relay terminals receive or transmit a signal alternately without an interference. Several singular value decomposition (SVD) based relaying schemes are proposed for the proposed relaying protocol to perform a coherent combining at the destination terminal. In addition, a weight matrix for each relay terminal is designed to increase the capacity of the relaying schemes. We show the theoretical derivations and the simulation results of the proposed schemes in the following sections. Those demonstrate an effectiveness of the proposed schemes.

关键词： Relays MIMO Wireless networks Wireless application protocol Transmitting antennas Interference Receiving antennas Transmitters Wireless communication Performance gain

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Generalized Schur Decomposition-Based Two-Way Relaying for Wireless MIMO systems

Generalized Schur Decomposition-Based Two-Way Relaying for W...

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IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

作者： Hyun Jong Yang Joohwan Chun Scientfic Computing Laboratory School of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

Deploying relay stations improves the signal-to- interference and noise ratio (SINR) by making a Pico cell environment. Nonetheless, a critical problem associated with deploying RS is additional resource consumption, which reduces the actual transmission rate. Two-way relaying schemes that use physical layer network coding (PNC) reduce the additional resource consumption and thereby improve the transmission rate. In this paper we propose a novel two-way relaying scheme for coded multiple-input multiple-output (MIMO) systems. The proposed scheme involves generalized Schur decomposition-based preceding and successive interference cancellation (SIC). By using the generalized Schur decomposition, orthogonal preceding matrices that minimize the transmit power can be applied, resulting in an improved transmission rate. We have evaluated the proposed system by comparing its transmission rate with that of several conventional schemes.

关键词： Relays MIMO Signal to noise ratio Working environment noise Physical layer Network coding Power system relaying Interference cancellation Silicon carbide Matrix decomposition

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LR-Aided precoding with a modified LLL algorithm for limited feedback MIMO systems

LR-Aided precoding with a modified LLL algorithm for limited...

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Asilomar Conference on Signals, systems & computers

作者： Hyun Jong Yang Joohwan Chun Scientfic Computing Laboratory School of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology Daejeon South Korea

It is well known that the lattice reduction (LR)-aided precoding system improves the channel condition and thereby the computational complexity at the mobile station can be dramatically reduced. Nonetheless, the feedback overhead of integer numbers in the infinite integer domain has been a bottleneck to implement the system for practical environments. In this paper, we propose a novel feedback method based on a modified Lenstra-Lenstra-Lovasz (LLL) algorithm. The proposed LLL algorithm reduces the required feedback considerably, and one can easily design the feedback system for a given number of feedback-bits by using the proposed LLL algorithm. The proposed algorithm was evaluated by comparing its bit error rate (BER) performance and the number of required feedback bits with those of the conventional ones.

关键词： Feedback MIMO Transmitters Throughput Matrix converters Bit error rate Maximum likelihood detection Design methodology computer science Lattices

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Metadata Management for Distributed Multimedia Storage system

Metadata Management for Distributed Multimedia Storage Syste...

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International Symposium on Electronic Commerce and Security

作者： Ling Zhan Jiguang Wan Peng Gu Key Laboratory of Data Storage System School of Computer Science and Technology Huazhong University of Science and Technology Wuhan Hubei China School of Electrical Engineering and Computer Science University of Central Florida Orlando FL USA

ISBN: (纸本)9780769532585

As a result of the multimedia rapid growth, there has been a huge increase in the amount of information generated and shared by people all over the world. Demand for large-scale multimedia storage system is growing rapidly. This paper describes the design and implementation of the Two-level metadata server for distributed multimedia storage system (DMSS). The DMSS divides the logical view of the stored data from the physical view. The logical view is managed by the metadata server which is called GMS (global metadata server), and the physical view is managed by a component of storage servers which is called LMS (local metadata server). Adopting LMS, each storage server can maintain its own storage resources and metadata and data independently, and can offer storage service independently. The DMSS allows the application servers to access the storage servers directly and in parallel providing very high performance.

关键词： Servers Multimedia communication Multimedia systems Least squares approximation system performance File systems Heart beat

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Security analysis and design of an online score system

Security analysis and design of an online score system

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IEEE International Workshop on Anti-counterfeiting, Security, Identification, ASID

作者： Xiaoyao Xie Yang Xu Zhijie Liu Yizai Yang Anyu Zhang School of Computer Science and Technology Guizhou University Guiyang China Key Laboratory of Information and Computing Science of Guizhou Province Guiyang China

With the fast development of network technology, computer technology, digitized information technology and image processing technology, some online score systems based on the network are developed in recent years. However, they only can be used in the local area network. Thus, a new online score system is designed and implemented to able to be used in the Internet. The structures of this system are presented. With the structures, a security requirement model of the system is founded. Then the security mechanisms of the system are analyzed and designed. The results of the applications show that the new system is highly effective and the security mechanisms are reliable.

关键词： Local area networks Information security Data security Hardware Web server Internet Software architecture Image databases Network servers computer networks

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Novel method for parallel radiosity algorithm with scene distribution

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Journal of Information and Computational science 2008年第2期5卷 631-637页

作者： Wang, Riwei Zhang, Hua Cen, Jiake Ming, Lei Xue, Yanbing College of Information Technical Science Nankai University Tianjin 300071 China School of Computer Science and Technology Tianjin University of Technology Tianjin 300191 China Tianjin Key Laboratory of Intelligence Computing and Novel Software Technology Tianjin 300191 China

During the present time, one of the most important areas of research in computer graphics is focused on improving the performances of global illumination methods. The main problem of simulating large scenes with global illumination method is highly time-consuming. In this paper, a new partitioning method for achieving a good load balance on a distributed memory system is presented. Also a simple and general solution is provided. In order to evaluate the proposed method, a radiosity algorithm running on PC Cluster is developed as a test. An efficient performance in terms of scalability and speedup has been obtained.

关键词： computer graphics

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Detecting Abnormal Activities in Video Surveillance with multi-Models

Detecting Abnormal Activities in Video Surveillance with mul...

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2008 5th International Conference on Visual Information Engineering (VIE 2008)

作者： Xiu-xiu Li Jiang-bin Zheng Jian-min Wu Guo-feng Hou School of Computer Northwestern Polytechnical University Xi'an Shaanxi China National Defense Science and Technology key laboratory for Avionics System Integration Technology China

In this paper, an adaptive method for detecting abnormal activities in video surveillance is proposed. In this method, a multi-Gaussian distribution called activity model is used to model a moving object activities. The activity model parameters are updated to satisfy the object motion attributes in a real-time when every new frame comes, and at same time this moving object current activity can be recognized by means of its possibility in the activity model. The advantage of this method is that the proposed activity models can update itself adaptively to match the current motion style of the object. The models are robust to the light change in the style of the object activity, and they are sensitive to these activities that do not meet the models. Several experiments are given to show that the proposed method is efficient.

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JobGrid: Chinese College Graduates Employment Information Grid system

JobGrid: Chinese College Graduates Employment Information Gr...

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ChinaGrid Annual Conference (ChinaGrid)

作者： Feng Zhao Bin Zhou Xiaoxing Sun Hai Jin Song Wu School of Computer Science and Technology Huazhong University of Science & Technology Wuhan China Cluster and Grid Computing Lab Wuhan China The State Key Laboratory of Virtual Reality Technology and Systems Beijing China School of Computer Science and Engineering Beihang University Beijing China

ISBN: (纸本)9780769533063

This paper proposes a realistic data grid system named JobGrid to construct information platform for Chinese college graduates employment, which supports centralized transaction processing to ensure consistent, effective operation in data access, control, monitor and analysis, and distributed data management to provide heterogeneous data integration, conversion, exaction and export. JobGrid has implemented global uniform view and massively heterogeneous data access, and provided efficiently data and transactions processing and cooperative control mechanism for distributed resource over grid.

关键词： Databases Educational institutions Distributed databases Servers Monitoring computer architecture Employment

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Scalability Support for SMI-S with Chord

Scalability Support for SMI-S with Chord

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IEEE International Conference on High Performance computing and Communications (HPCC)

作者： Ze Deng Dan Feng Zhan Shi Chao Luo Key Laboratory of Data Storage System Ministry of Education School of Computer Huazhong University of Science and Technology Wuhan Hubei China

The storage management initiative specification (SMI-S) has been proposed for years to standardize the management of storage resources in storage area network (SAN). However, current management architecture mainly focuses on local area management. In this paper, we propose a scalable management architecture based on the integration of SMI-S and Chord. Meanwhile, Chord can only deal with exact query, the query of storage resources is significantly more complex. To deal with this problem, we further improve our architecture with a scalable blind search method - recursive partition search (RPS). Experiments show RPS is an effective approach for storage resource range query in the case that the Chord overlay network is not very large.

关键词： computer architecture computer integrated manufacturing XML Databases Scalability Storage area networks Partitioning algorithms

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